非线性节理模型对应力波传播影响的数值分析

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Abstract Firstly，in order to validate the DEM software UDEC in simulating the wave propagation across a rock mass with two sets of nonlinear joints，two examples were computed with a nonlinear joint model embedded in UDEC. The results agreed well with the existing theories. Secondly，the influence of the angle and space of joints on the propagation of stress wave across two sets of intersecting joints was studied. It was found that the attenuation of stress wave across two sets of intersecting joints was greater than that across the parallel joints under the same angle and joint space. Transmission coefficient reduced with increasing the angle. The space of the intersecting and parallel joints had the similar influence on the transmission coefficient. Finally，a parametric study was conducted to investigate the effects of the angle ? between the joints and the stress wave，the angle ? between the two sets of joints，the space for each set of joints and the width of joint area L. The analytical results showed that the influences of ? and ? were different with the ranges changing. The similarities existed between the influence of space of intersecting joints and parallel joints. With the increasing of L，the attenuation decreased significantly firstly and then slowed down. Hyperbolic function was employed to fit the result and the fitting result had good agreement.

Key words： numerical simulation nonlinear joint stress wave DEM

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https://rockmech.whrsm.ac.cn/EN/Y2015/V34/I5/953

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